Among the companies with shares expected to actively trade in Thursday's session are Facebook Inc. (FB), TripAdvisor Inc. (TRIP) and Sequenom Inc. (SQNM).

Facebook swung to a second-quarter profit as the world's largest social network continued building up its mobile advertising business and posted stronger revenue. Shares jumped 25% premarket to $32.67 as results easily beat market expectations.

TripAdvisor's second-quarter earnings rose 26% as the hotel-reviews site recorded a surge in revenue. Shares rose 14% to $69.25 in premarket trading as results, driven by continued traffic growth, beat Wall Street estimates.

Sequenom's second-quarter loss widened as the life-sciences company logged an increase in interest expense and said reimbursement issues hurt its diagnostic revenue. Shares plummeted 34% to $3.11 premarket as results fell short of Wall Street expectations.

Biogen Idec Inc.'s (BIIB) second-quarter earnings rose 27% as the sales launch of Tecfidera contributed to the biotechnology company's better-than-expected revenue growth. Shares rose 6.1% to $236.15 premarket as the company also raised its full-year earnings estimate.

Baidu Inc.'s (BIDU, K3SD.SG) second-quarter earnings fell 4.5%, reversing a history of profit growth as the Chinese Internet search company's heavy expenses offset a sharp increase in revenue. Still, the company's American depositary shares rose 20% premarket to $132.39 as results beat expectations and the company gave a rosy revenue outlook for the current quarter.

Under Armour Inc.'s (UA) second-quarter profit more than doubled as the athletic-goods maker reported higher sales of base-layer apparel, as well as football cleats and other shoes. Results topped Wall Street's expectations and the company raised its typically conservative guidance. Shares rose 8.4% to $67 premarket.

Boston Scientific Corp. (BSX) swung to a second-quarter profit as a hefty impairment charge weighed on the medical-device maker's year-ago results, though revenue slipped slightly in the latest period. Shares rose 8.7% to $10.45 premarket as the company's results beat its own estimates and the firm raised its full-year outlook.

PulteGroup Inc.'s (PHM) second-quarter earnings fell 14% as the home builder's higher costs masked stronger closing and selling prices. Shares fell 5.2% to $17.50 premarket as the company's results missed expectations on both top and bottom lines.

Citrix Systems Inc.'s (CTXS) second-quarter earnings fell 30% as the enterprise software maker posted weaker margins and higher expenses and as an income-tax benefit boosted year-earlier results. Still, shares jumped 7.1% premarket to $70.75 as results beat the company's expectations.

Crocs Inc.'s (CROX) second-quarter earnings fell 43% as increased discounting late in the quarter in the Americas and Europe contributed to lower margins and overhead costs rose. The footwear maker's shares fell 25% to $13 in premarket trading as adjusted earnings and revenue missed expectations and the company projected third-quarter results below Wall Street views.

Western Digital Corp.'s (WDC) fiscal fourth-quarter profit fell 44% as the disk-drive maker was hurt by weak demand for personal computers. Shares slipped 6.1% to $63.70 premarket.

Data-center operator Equinix Inc. (EQIX) swung to a second-quarter loss as debt-related expenses masked revenue growth. Shares fell 4.5% premarket to $183 as the company also gave a pessimistic revenue outlook.

F5 Networks Inc.'s (FFIV) fiscal third-quarter earnings slipped 5.7% as the company reported higher costs and weaker sales in its products division, despite a boost in services sales. Shares rose 9.5% to $87.50 premarket as results topped the company's outlook.

TriQuint Semiconductor Inc.'s (TQNT) second-quarter loss widened as the chip maker posted a smaller income tax benefit from a year earlier; however, core results beat the company's expectations. Shares climbed 15% to $7.88 premarket as TriQuint also offered upbeat forecast for the current quarter and full year.

Xoom Corp. (XOOM) swung to a surprise profit in the second quarter as the international money-transfer provider reported a jump in revenue. Shares rose 16% to $31.31 premarket as results topped the company's forecasts.

 
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Moody's Investors Service put its junk-level ratings on AK Steel Holding Corp. (AKS) on review for downgrade, as the steelmaker has been challenged by weaker prices.

Akamai Technologies Inc.'s (AKAM) second-quarter earnings rose 40% as the Internet technology company continued to post strong revenue growth and margins improved.

Ameriprise Financial Inc.'s (AMP) second-quarter earnings rose 44% as the financial-services company and asset manager reported broad revenue growth and a strong performance at its advice and wealth-management business.

Angie's List Inc.'s (ANGI) second-quarter loss narrowed as the online-reviews site posted improved revenue and stronger membership rolls.

AptarGroup Inc.'s (ATR) second-quarter earnings increased 19% as an acquisition boosted the dispenser manufacturer's revenue.

Assurant Inc.'s (AIZ) second-quarter profit fell 21% as declines at its health and benefits businesses offset gains at its core specialty property business.

AvalonBay Communities Inc.'s (AVB) second-quarter earnings plunged 77% due to the acquisition of its stake in Archstone Enterprise LP earlier this year as well as a drop in gains from dispositions of real-estate assets, but funds from operations improved more than expected.

Bank of America Corp. (BAC) has appointed two veteran banking executives to the North Carolina bank's board, appointments that expand the company's board to 15.

CA Inc.'s (CA) fiscal first-quarter earnings climbed 40% as a tax benefit helped the software maker's results, though subscription and maintenance revenue fell.

Cabot Oil & Gas Corp.'s (COG) second-quarter earnings more than doubled as the company's revenue beat expectations, driven by a jump in natural-gas output.

Cheesecake Factory Inc.'s (CAKE) second-quarter profit was essentially flat, inching up 0.6%, as the restaurant-chain operator recorded a charge tied to the relocation of two of its namesake restaurants. Adjusted earnings missed the company's own forecast and revenue fell short of Wall Street estimates.

Crown Castle International Corp.'s (CCI) second-quarter profit fell 55% as the cell-tower company recorded heavy tax-related charges, masking revenue growth.

Equifax Inc.'s (EFX) second-quarter earnings rose 19% as the credit-reporting company posted double-digit revenue growth and improved operating margins.

Flowserve Corp.'s (FLS) second-quarter earnings grew 12% as the diversified manufacturer reported higher sales and expanding margins, helping results top Wall Street's expectations.

Fortune Brands Home & Security Inc.'s (FBHS) second-quarter profit jumped 34% due to strong demand for the company's kitchen and bath cabinetry, as well as higher sales for plumbing gear, windows and doors.

Johnson Controls Inc. (JCI) has named Alex Molinaroli as the car-battery maker's new chief executive, succeeding Stephen Roell, who is retiring at the end of the year.

Las Vegas Sands Corp.'s (LVS) second-quarter earnings more than doubled as the casino and resort operator company posted stronger operating results in Macau and as an impairment charge weighed on year-earlier results.

Chip designer LSI Corp.'s (LSI) second-quarter earnings decreased 58% as revenue weakened. It also declared its first cash dividend, a payout of three cents a share.

O'Reilly Automotive Inc.'s (ORLY) second-quarter earnings rose 21% as the auto-parts retailer's sales and gross margin both increased, despite higher costs.

Owens-Illinois Inc.'s (OI) second-quarter profit slipped 0.8% on lower volumes, though the company raised prices and reported an increase in sales in Europe and North America.

Qualcomm Inc.'s (QCOM) fiscal third-quarter profit jumped 31%, driven by continued global demand for smartphones that use its chips.

Range Resources Corp.'s (RRC) second-quarter profit more than doubled as the oil and gas company reported a sharp jump in daily production, higher prices and lower costs.

Raymond James Financial Inc.'s (RJF) fiscal third-quarter earnings rose 9.8% as the regional broker reported higher revenue thanks in large part to growth in its asset-management business.

Ruby Tuesday Inc.'s (RT) fiscal fourth-quarter loss widened as the casual-dining chain reported weaker same-store sales and an expense tied to deferred tax assets. Adjusted profit and the revenue decline for the latest period missed Wall Street's expectations.

SL Green Realty Corp.'s (SLG) second-quarter profit fell 75% as the real estate investment trust recorded fewer one-off gains, though rental revenue increased.

Teradyne Inc.'s (TER) second-quarter profit fell 40% as the maker of chip-testing equipment continued to suffer from weak demand. The company also gave a lackluster view of the current quarter.

Terex Corp.'s (TEX) second-quarter profit slumped 75% as restructuring charges weighed on the bottom line and the construction-machinery maker reported weaker sales.

Tractor Supply Co.'s (TSCO) second-quarter earnings rose a better-than-expected 16% as the retailer recorded a jump in revenue despite a slow start to spring.

Varian Medical Systems Inc.'s (VAR) fiscal third-quarter profit grew 3.7% due to higher sales, though the medical-equipment and software maker trimmed its full-year targets as it faces pressure from a weaker yen. The company also lowered its full-year projections.

Moody's Investors Service cut its ratings on Walter Energy Inc. (WLT) two notches deeper into junk territory, the ratings firm's second downgrade on the coal producer since June as it raises fears about an oversupplied metallurgical coal market.

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Warner Chilcott PLC's (WCRX) second-quarter profit more than doubled as the pharmaceutical company's prior-year results were stung by a steep impairment charge.

Whiting Petroleum Corp.'s (WLL) second-quarter profit slid 10% as the oil-and-gas company's prior-year results had higher derivative gains, though production and prices in the latest period jumped.

Willis Group Holdings PLC's (WSH) second-quarter earnings slipped 2.8% as the insurance broker's increase in expenses outpaced revenue growth.

Write to Anna Prior at anna.prior@dowjones.com

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